Of 36 counties in the Union State, Union County is 17th in terms of its size (2,038 square miles). Union County is in Eastern Oregon. There is about 2,000 acres of riverfront land and property for sale in Union County, Oregon, based on recent Land Network data. The combined market value of ranches, farms, hunting land and other rural land and acreage for sale here is $10 million. Browse all waterfront property for sale in Union County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits! The most common type of land for sale by combined acreage in Union County is house.